This work aims to learn a high-quality text-to-video (T2V) generative model by leveraging a pre-trained text-to-image (T2I) model as a basis. It is a highly desirable yet challenging task to simultaneously a) accomplish the synthesis of visually realistic and temporally coherent videos while b) preserving the strong creative generation nature of the pre-trained T2I model. To this end, we propose LaVie, an integrated video generation framework that operates on cascaded video latent diffusion models, comprising a base T2V model, a temporal interpolation model, and a video super-resolution model. Our key insights are two-fold: 1) We reveal that the incorporation of simple temporal self-attentions, coupled with rotary positional encoding, adequately captures the temporal correlations inherent in video data. 2) Additionally, we validate that the process of joint image-video fine-tuning plays a pivotal role in producing high-quality and creative outcomes. To enhance the performance of LaVie, we contribute a comprehensive and diverse video dataset named Vimeo25M, consisting of 25 million text-video pairs that prioritize quality, diversity, and aesthetic appeal. Extensive experiments demonstrate that LaVie achieves state-of-the-art performance both quantitatively and qualitatively. Furthermore, we showcase the versatility of pre-trained LaVie models in various long video generation and personalized video synthesis applications.

该研究论文提出了LaVie，一个整合的视频生成框架，通过利用预训练的文本到图像模型作为基础，以学习高质量的文本到视频生成模型。通过引入简单的时间自注意机制以及联合图像-视频微调的过程，LaVie能够生成视觉逼真且时间连贯的视频，并保留预训练T2I模型的创造性。经广泛实验证明，LaVie在性能上取得了最先进的表现，并可用于不同的长视频生成和个性化视频合成应用。

LAVIE：级联潜在扩散模型的高质量视频生成